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''Turbonilla asperula'' is a species of sea snail, a marine gastropod mollusk in the family Pyramidellidae, the pyrams and their allies.〔Rosenberg, G. (2011). ''Turbonilla asperula'' Bush, 1899. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=533542 on 2012-03-01〕 ==Description== The shell grows to a length of 3 mm. The small, slender shell has a golden brown color with slight lustre. The prominent oblique protoconch consists of but little over one whorl. The teleoconch consists of 6 moderately convex, somewhat shouldered whorls. The 26 transverse ribs are slender, prominent, oblique (inclined to the right) and with a decided angle at the shoulder of the whorls. They extend over the periphery of the body whorl and decreas gradually in size on the base. The wide and deep interspaces are crossed on the body whorl by 5 (sometimes 6) about equal and evenly spaced, raised, rounded, spiral lines, the firs0 of which is just at or a little below the slhoulder, and the last just at the periphery. They appear to render the sides of the ribs very irregular and the alternating spaces are crossed by scarcely discernible striae. The base of the shell is elongate, ornamented between the ribs by 4 more prominent, widely separated, raised, spiral lines, below which there are ill-defined fine ones. The aperture is ovate. The peritreme is continuous. 〔 ( K.J. Bush (1899), Descriptions of New Species of Turbonilla of the Western Atlantic Fauna, with Notes on Those Previously Known; Proceedings of the Academy of Natural Sciences of Philadelphia, Vol. 51, No. 1 (Jan. - Mar., 1899), p. 152 ) 〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Turbonilla asperula」の詳細全文を読む スポンサード リンク
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